options for NRF.setAdvertising?

let me explain myself:

1. 0x180f - where this came from ? in the link you sent there is no refernce to this
   is this something unique to espruino? or it's a known bluethooth information?

2. I want to be able to scan and advertise my device at the same time .
   so if I'm correct I need to use 2 devices , one for scanning all the time , and 1 sending my data
   is it true?
   or I can use only 1 and do some manipulation in the timing?
   I don't need that someone will connect me - just to show I'm alive .
   I have try to use this function:

   NRF.setAdvertising({},{name:"test1",conn­ectable:"false",scannable :"false",interval:1000});
   

but I;m steel able to connect to "test1" - why?

3 . I want to change my own MAC for testing issue , so I will know which MAC I'm testing,
more easy for me - this is the reason.